# Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 79 - 82 of 124

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## Question number: 79

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

### Question

Voltage (r. m. s) in the secondary coil of a transformer depends upon

(1) Voltage in the primary coil

(2) Ratio of number of turns in the two coils

(3) Frequency of the source

(4) Time-period of the source

Select the correct answers and mark it according to the following

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

## Question number: 80

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

### Question

Two inductors L 1 and L 2 are at a sufficient distance apart. Equivalent inductance when they are connected (i) in series (ii) in parallel are

### Choices

Choice (4) Response

a.

b.

None

c.

d.

## Question number: 81

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

Assertion-Reason▾

### Assertion (Ꭺ)

The induced e. m. f. and current will be same in two identical loops of copper and aluminum, when rotated with same speed in the same magnetic field.

### Reason (Ꭱ)

Induced e. m. f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

## Question number: 82

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

### Question

A current of 5A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200V and 50 % of power is lost, then the current in the secondary coil will be -

### Choices

Choice (4) Response

a.

0.25A

b.

0.025A

c.

5A

d.

2.5A

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